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Al Introduction -__ 2 General geologic setting  3 Methods of investigation  3 Nomenclature  _ 6 Stratigraphy  _ 9 Cussewago Sandstone  _ 9 Bedford Shale  11 Unnamed sandstone  12 Berea Sandstone  _ 13 Corry Sandstone  14 Shellhammer Hollow Formation  16 Cuyahoga Group (Orangeville Shale, Sharpsville Sandstone, Meadville Shale)  17 Orangeville Shale  _ 18 Bartholomew Siltstone Member  19 Sharpsville Sandstone  19 Meadville Shale  21 Shenango Formation  22 Lower member  23 Upper member  25 References  26

Mississippian stratigraphy of northwestern Pennsylvania